Last month, Motley Fool co-founder and CEO Tom Gardner traveled to Austin, Texas, to interview John Mackey, founder and co-CEO of Whole Foods Market (NYSE: WFM).

Whole Foods has been a tremendous growth story since its start in 1980 as a single, small store; it’s now a $17 billion organic and natural grocery store market leader with more than 300 stores.

One key aspect of its success has been its workplace culture, which is frequently cited as tops in its industry. Watch the video to see why Mackey believes that culture is a competitive advantage -- and something investors may want to pay attention to. (A transcript is provided below; running time: 2:44.)